Back in the good ol' days, the keyboardist would give me a G and I'd tune from there. No problems. Now I'm using a Boss TU3 tuner pedal that everyone seems to be using. But it's taken a while to realize that it doesn't seem to be accurate below a certain pitch (I'm also a piano tuner). I tune the G string and it sounds fine with the keyboard. but the lower I play, the sharper it tunes the other open strings. I thought it was a badly-fit nut , I thought the guitarists were out (Jury's still out on that one...), I thought I was putting too much force on the bass with my right elbow (a habit I've since broken), and various other things. Last Sunday, I was checking intonation and tuning with the Boss tuner. I was playing octaves and 5ths and NOTHING was lining up. So, I tuned just the G string and then used harmonics, octaves and 5ths (hey, kinda like the way I tune pianos, but without the 3rds and the 6ths). NOW the bass sounds in tune with itself and with the rest of the band. In fact, the improvement was startling. The lead worship Pastor and MD/keyboardist noticed the difference right away. I'm really ashamed it took so long to figure this out While I'm naturally a big fan of tuning by ear, I'd like to use a tuner for the expediency and the convenience in noisy environments. Is there a known issue with the boss pedals and basses? I realize some tuners may not do well with the extended range of 5-string basses. I could check the tuning against the Boss pedal and make note of the offsets, but that little rascal would be hard to read with my 56-year-old eyes. I could always use the iPad that I tune pianos with sometimes and use its tuning-store feature, but that would be a little complicated and untidy, although not out of the question. And if I hear that tuning the G to the pedal, then fuggettaboutit and tune the rest of the bass by ear really is the best way, so be it. And thanx for confirming my thoughts!